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The chart below shows the most common questions asked by owners of Detroit Diesel® engines 6V71 Turbo when trying to troubleshoot why their engines underperform.  It categorizes areas of possible malfunction, likely cause and recommended action to bring your new, rebuilt or used  Detroit Diesel® engine back to proper operation.  The chart will give you confidence when speaking with your Detroit Diesel® engine mechanic or ordering parts.  As a quick reference guide only, the chart must not be thought of as a substitute for the use of your Detroit Diesel® engine 6V71 Turbo Owner's operating or service manual.

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Engine will not start Lack of air intake or restricted air intake
Broken blower shaft  
Worn out blower shaft  
Defective fuel pump  
Defective starter  
Discharged battery  
High exhaust back pressure  
Black smoke coming out of engine Defective injector  
Contaminated fuel  
Broken or worn cylinder parts  
Engine overloaded  
Faulty intercooler or aftercooler (for turbo engines only)  
White smoke coming out of engine Broken piston ring  
Incorrectly installed ring set  
Defective injector  
Fuel quality or grade  
Long idle periods  
Broken or bent push rod  
Injector or governor improperly adjusted  
Low engine oil pressure Water in engine oil pan  
Fuel in engine oil pan  
Defective oil cooler  
Engine overloaded  
Crankcase overfilled  
Low engine RPM Improperly working injector  
Governor calibration  
Hi engine RPM Governor calibration  
Engine overheating Defective fresh water pump  
Defective raw water pump (marine engines only)  
Defective thermostat or thermostat seal  
Clogged radiator or heat exchanger (marine engine only)  
Grey smoke coming out of engine Long idle periods  
Defective intercooler or aftercooler (for turbo engine only)  
Restricted air intake  
Defective injector  
Contaminated fuel  
Blower or turbocharger seals leaking  
Geartrain makes noises Low oil level  
Engine driven accesories  
Damage main or rod bearing  

Detroit Diesel 6V71 Usefull Information 

We carry a huge selection of parts for the 6V71 Detroit. Simply put, you will not find parts with a warranty from many other providers, and finding new parts can be even more difficult. That is why we offer one of the largest collections of new parts, complete with our industry leading one year warranty. We have been in business for over 10 years, and have served many satisfied customers since then, and have developed a reputation in the industry for delivering Detroit Diesel parts that are of premium quality and built to last. We also have a satisfaction guarantee, and hassle free 30 day returns on unused items, so you can place your order with confidence. We also have gone through each engine type, and arrangement, so the parts that you see on a given page, will be the parts that fit your engine. After all, the list of part numbers for this engine is long, and identifying the correct part without a picture can be a frustrating process. This is why you never need part numbers to place an order with us. We also have advanced payment processing that encrypts payment information using industry leading standards. Try Diesel Pro today, and you will see we are a better way to buy parts online.

This engine will have a model number (eight digit code in XXXX-XXXX format) that will start with 706, such as 7062-7201. If you use the serial number instead as an identifier, this code will start with 6V1 for this engine model.

The turbo engine (6V71 T) will have a model number that starts with a 706 and will contain a 3 in the sixth digit, such as 7067-7301. If the sixth digit is a 2, then your engine is a natural, or non-turbo engine.

Detroit Diesel 6V71 Specs and General Info

The Detroit Diesel 6V71 has six cylinders, a displacement of 425.6 inches ³, a bore of 4.25 inches and a stroke of 5 inches, and four main bearings.

Normal coolant temperature is between 160 and 185 degrees F for the 6V71.

Coolant capacity is 7.5 gallons.

Normal oil temperature is between 200 and 235 degrees F.

Normal oil pressure (PSI) is between 40-55 at 1200 RPM, and 50-70 at 2100 RPM.

Oil capacity is 22 quarts.

Torque and Horsepower

Listed below is the torque and horsepower information for the 6V71 Detroit. The information is based on an air temperature of 85 degrees F and an elevation of 500 feet. Brake horsepower is used to measure horsepower.

Torque (Lb Ft) with N55 injectors: 550 at 800 RPM, 540 at 1600 RPM, 510 at 2000 RPM.

Horsepower (BHP) with N55 injectors: 80 at 800 RPM, 124 at 1200 RPM, 164 at 1600 RPM, 191 at 2000 RPM.

Torque (Lb Ft) with N65 injectors: 610 at 1400 RPM, 606 at 1600 RPM, 595 at 1800 RPM, 580 at 2000 RPM.

Horsepower (BHP) with N65 injectors: 163 at 1400 RPM, 185 at 1600 RPM, 205 at 1800 RPM, 222 at 2000 RPM

Marine Engine Torque, Horsepower and Fuel Consumption

Horsepower is measured as shaft horsepower, and at a temperature of 85 degrees F. Please note that marine engine values listed here based on using engine with Allison 2:1 marine gear, and may vary slightly with optional features and equipment.

Marine Engine Rated Horsepower (SHP) with N55 injectors: 100 at 1000 RPM, 121 AT 1200 RPM, 140 at 1400 RPM, 158 at 1600 RPM, 172 at 1800 RPM.

Fuel Consumption with above conditions: 7 gal/hour at 1200 RPM, 9.5 gal/hour at 1800 RPM.

Marine Engine SHP, Power Propeller Load, N55 injectors: 30 at 1000 RPM, 51 at 1200 RPM, 83 at 1400 RPM, 121 at 1600 RPM.

Fuel Consumption with above conditions: 3.5 gal/ hour at 1200 RPM, 5 gal/ hour at 1400 RPM, 7 gal/ hour at 1600 RPM, 9.5 gal/ hour at 1800 RPM.

Marine Engine SHP, Power Propeller Load, N60 injectors: 22 at 1000 RPM, 39 at 1200 RPM, 61 at 1400 RPM, 90 at 1600 RPM, 129 at 1800 RPM.

Fuel Consumption with above conditions: 2.75 gal/ hour at 1200 RP, 3.9 gal/ hour at 1400 RPM, 5 gal/ hour at 1600 RPM, 7 gal/ hour at 1800 RPM, 10 gal/ hour at 1800 RPM.

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